Quantifying the Stable Water Isotopologue Exchange Between the Snow Surface and Lower Atmosphere by Direct Flux Measurements
| Autor: | Maria Hörhold, Joachim Reuder, S. Wahl, Hans Christian Steen-Larsen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Petroleumsgeologi og -geofysikk: 464 [VDP] 0207 environmental engineering Eddy covariance Greenland ice sheet 02 engineering and technology Atmospheric sciences 01 natural sciences Petroleum geology and geophysics: 464 [VDP] Physics::Geophysics Atmosphere Ice core Diurnal cycle Earth and Planetary Sciences (miscellaneous) Astrophysics::Solar and Stellar Astrophysics Isotopologue 020701 environmental engineering Astrophysics::Galaxy Astrophysics Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences Snow Geophysics 13. Climate action Space and Planetary Science Sublimation (phase transition) Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | e2020JD034400 Journal of Geophysical Research (JGR): Atmospheres |
| Popis: | Surface processes in high latitudes play an important role in global climate and thus understanding the physics of these systems is critical for improving climate projections. The characterization of the stable water isotopologue flux between the surface and the atmosphere offers the potential to constrain parameterizations of these physical surface exchange processes in numerical models. In addition, observations of isotopologue surface fluxes allow the evaluation of surface fluxes as a process influencing the formation of the climate signal retrieved from ice core isotopologue records. Here, we present a record of stable water isotopologue surface fluxes measured in-situ in the accumulation zone of the Greenland Ice Sheet at the East Greenland Ice Core Project site. We measured isotopologue fluxes above the snow surface directly by combining high-frequency eddy covariance measurements with low-frequency isotopologue measurements from a cavity ring-down spectrometer (CRDS). We developed a method to correct for the high-frequency loss of the CRDS by combining humidity measurements from both the CRDS and eddy covariance instruments. Using this approach our measurements provide the first direct observations of water isotopologue fluxes in polar areas. We observed a clear diurnal cycle in the fluxes of the different water isotopologues. The isotopic composition of the sublimation and deposition flux showed to be dependent on the snow and vapor isotopic composition, respectively. To a first order, the isotopic composition of the sublimation flux could be derived assuming equilibrium fractionation during sublimation. publishedVersion |
| Databáze: | OpenAIRE |
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